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A quantitative criterion for determining the order of magnetic phase transitions using the magnetocaloric effect

Author

Listed:
  • Jia Yan Law

    (Universidad de Sevilla)

  • Victorino Franco

    (Universidad de Sevilla)

  • Luis Miguel Moreno-Ramírez

    (Universidad de Sevilla)

  • Alejandro Conde

    (Universidad de Sevilla)

  • Dmitriy Y. Karpenkov

    (Technische Universität Darmstadt)

  • Iliya Radulov

    (Technische Universität Darmstadt)

  • Konstantin P. Skokov

    (Technische Universität Darmstadt)

  • Oliver Gutfleisch

    (Technische Universität Darmstadt)

Abstract

The ideal magnetocaloric material would lay at the borderline of a first-order and a second-order phase transition. Hence, it is crucial to unambiguously determine the order of phase transitions for both applied magnetocaloric research as well as the characterization of other phase change materials. Although Ehrenfest provided a conceptually simple definition of the order of a phase transition, the known techniques for its determination based on magnetic measurements either provide erroneous results for specific cases or require extensive data analysis that depends on subjective appreciations of qualitative features of the data. Here we report a quantitative fingerprint of first-order thermomagnetic phase transitions: the exponent n from field dependence of magnetic entropy change presents a maximum of n > 2 only for first-order thermomagnetic phase transitions. This model-independent parameter allows evaluating the order of phase transition without any subjective interpretations, as we show for different types of materials and for the Bean–Rodbell model.

Suggested Citation

  • Jia Yan Law & Victorino Franco & Luis Miguel Moreno-Ramírez & Alejandro Conde & Dmitriy Y. Karpenkov & Iliya Radulov & Konstantin P. Skokov & Oliver Gutfleisch, 2018. "A quantitative criterion for determining the order of magnetic phase transitions using the magnetocaloric effect," Nature Communications, Nature, vol. 9(1), pages 1-9, December.
    • Handle: RePEc:nat:natcom:v:9:y:2018:i:1:d:10.1038_s41467-018-05111-w
    DOI: 10.1038/s41467-018-05111-w
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    Cited by:

    1. Yi-Hong Gao & Dong-Hui Wang & Feng-Xia Hu & Qing-Zhen Huang & You-Ting Song & Shuai-Kang Yuan & Zheng-Ying Tian & Bing-Jie Wang & Zi-Bing Yu & Hou-Bo Zhou & Yue Kan & Yuan Lin & Jing Wang & Yun-liang , 2024. "Low pressure reversibly driving colossal barocaloric effect in two-dimensional vdW alkylammonium halides," Nature Communications, Nature, vol. 15(1), pages 1-13, December.
    2. Deepak, K. & Varma, V.B. & Prasanna, G. & Ramanujan, R.V., 2019. "Hybrid thermomagnetic oscillator for cooling and direct waste heat conversion to electricity," Applied Energy, Elsevier, vol. 233, pages 312-320.

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